I ran a bull 2 months with 5 cows, 3 of those cows had there calves within a week of each other , one of the other two left does not even look preg and cows try to ride her so pretty sure shes not bred not sure about the last one she is an older cow not bagging up but looks pretty big. Can waiting to long to wean last calves have an impact on preg the two cows not calving were the last to wean ?(calves about 7 mo when weaned)